- Add language switch link to root README - Translate README.md to docs/zh-CN/README.md - Translate USER-GUIDE.md to docs/zh-CN/USER-GUIDE.md - Translate all 13 reference documents to docs/zh-CN/references/ Key terminology mappings: - context engineering → 上下文工程 - spec-driven development → 规格驱动开发 - context rot → 上下文衰减 - phase → 阶段 - milestone → 里程碑 - roadmap → 路线图 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>